Ink pad for duplicating machines



R. A. DALTON.

lINK PAD FOR DUPLICATING MACHINES April 16, 1940.

2 Sheets-Sheet 1 Filed Sept. 8, 1938 April 1'6, 1940.

R. A. DALToN INK PAD FOR DUPLICATING MACHINES Filed Sept. 8, 1938 2 Sheets-Sheet 2 Summa/u Patented Apr. 16, 1940 UNITED STATES im; PAD Fon DUPLIOATING MACHINES Robert A. Dalton, Bridgeport, Conn., assignor` to n Remington Rand Inc., Buffalo, N. Y., a corporation of Delaware Application september s, 193s, serial No. 228,985

5 Claims.

My invention relates to stencil duplicating machines, and more particularly to improvements in an ink pad for useon such machines.

One of the main objects of my invention,

5 `generally stated, is to provide an improved, highly emcient and reliable ink pad for use on stencil duplicating machines.

A more specific object of my invention is to provide in an ink pad comprising a textile fabric sheet and a metal attaching member, an improved means for securing the yfabric sheet to the metal attaching member.

To the above and other ends which will here` inafter appear, my invention consists in the fea- 15 tures of construction, and arrangements of parts set forth in the following description and particularly pointed out in the appended claims.

In the drawings, wherein like reference characters designate corresponding parts in the different views:

Fig. luis an enlarged fragmentary plan View of an ink pad constructed inv accordance with the present invention.

Fig. 2 is an enlarged fragmentary sectional view of the same taken on line `2--2 of Fig. 1 and viewed in the direction of the arrows at said line.

Fig. 3 is an enlarged fragmentary sectional view of a portion ofthe same taken on line 3-3 of Fig. 2 and viewed in the direction of the a1"- rows at said line.

Fig. 4 is an enlarged fragmentary perspective detail view of a textile fabric sheet of the ink pad without the metal attaching members se'- 35 cured thereto.

Fig. 5 is a detail perspective view of one of the metal attaching members shown as it appears before it is connected to the cloth of the pad.

fio Fig. 6 is a sectional view of the same taken on line 6-6 of Fig 5 and viewed in the direction of the arrows at said line.

In certain well known types of duplicating machines, a rotary cylinder is employed which is provided with a perforated outer diaphragm,

over which is placed and stretched a textile fabric ink pad and a stencil sheet is secured around the outer surface of the pad. 'Ihe ink pad of such machines is of a textile fabric material 50 `or cloth which must be renewed from time to time, and accordingly it is desirable to provide an ink pad constructed and arranged so that it can be smoothly and securely attached to the diaphragm of the machine and yet which may be readily removed for replacement or for reversal of the position thereof on the diaphragm.

As shown in Fig. 1 of the drawings, the present ink pad comprises a sheet I0 of suitable textile material having an attaching member I2 secured to `each end thereof. The present inven- (Ci. 10i-415.1)

tion is concerned primarily with an improved means for securing these attaching members I2 to the ends of the sheet I0.

Heretofore difliculty has been found in effec-J tively connecting the ends of the cloth I0 to the end of the sheet IIJ by portions IU' of the sheet which are folded over and stitched at I I to form a loop of the cloth or fabric at each end of the sheet I0. In some instances it may be found desirable to turn in the raw edge of the fabric in forming these hems in the usual manner to prevent fraying or raveling thereof.

Each of the attaching members I2 in the present instance is of thin sheet metal and before being attached to the fabric I0 is preferably of a shape shown in Fig. 5. These attaching members I2 are adapted for convenient attachment tothe cylinder or diaphragm of the duplicating machine. In the form vof the attaching members sho-wn in the drawings, there are circular perforations I3 provided therein which receive pins` or projections ordinarily provided for attaching the ink pad to'the cylinder or diaphragm of the duplicating machine. AIt will be clear that these perforations I3v will be adapted by size and spacing to the ink pad securing means provided `on the machine in which the present ink pad is to be used. Each of the attaching members I2 may be reinforced by bending over a portion I2 alongone of the edgesv thereof.

An open loop or channel |22 is formed continuously along the other edge of each of the attaching members I2 before the sheet III is attached thereto. This open loop or channel of each of the attaching members is adaptedto receive a portion of the hem at one end of the sheet.V In order to evenly and securely hold the `end portions of the sheet I0 to the attaching 'members I2, a filler which in the present instance is in the form of a cord III is placed in the loop formed by hem Ill at keach end of the sheet. The cord or filler I4 is held taut against the outer end wall of the companion loop ory hem of the sheet IB. That portion of each hem which contains the cord I4 is then seatedin the open channel I22 of the companion attaching member I2 and one side wall of the channel is then crimped over theouter ledge portion ofthe hem to infold the portion of the hem which surrounds the cord I4, thereby clamping the cord and surrounding portion of the companion hem'v/ithin the channel |22.'

The side wall of the open channel |22 of each of the attaching members l2 may be crimped over the associated end of the sheet l by a suitable pressing device having a die adapted to close the edge portion of the attaching member forming the channel i22 inwardly against the fabric forming the loop in the sheet I0 as shown in Fig. 2. During this closing or crimping operation of the edge portion of the attaching members around the ends of the sheet Hl, care should be taken to hold the filler cord I4 taut and against vthe outer end Wall portion of the companion loop or hem in the sheet I0. For this purpose, suitable means may be provided for gripping the extending ends of the cord It and for holding the cord in a taut condition While the closing dies are crimping the edge portion lof the attaching member over the companion hem.

In order to further secure the ends of the sheet l0 to the attaching member I2, a plurality of indentations I6 are pressed into the portion of the attaching member which infold the hem of the sheet lil. These indentations I 6 may `be formed simultaneously With the closing operation of the side Wall of the attaching member over the hem of the sheet Ii! by providing pointed l punches on the closing die adapted to form small points ISH on the folded over portion i2270f the channel which points pinch or are embedded in the fabric forming the 'hem at these points.

It Will be noted in Fig. 2 that the attaching members I2 are applied in a reverse orderto the opposite ends of the sheet iii. That is, 'the edge portion of one of the attaching members is crimped over one surface of the sheet |20 at one end, while the corresponding edge portion of the other attaching member' is crimped over the opposite surface of the other end of the sheet. It Will also be observed in Fig. 2 that the hem portion at each end of the sheet Il) is doubled backward over the edge of the companion attaching member, thereby covering this edge -of the metal and providing an additional' grip between the fabric and this metal edge. It will further be observed that the free edge of the folded portion of each of the attaching members is crimped or closed against a double thickness of the fabric between the stitching Il and the end of the companion hem thereby reducing the strain on the threads of the fabric at these points.

It will be seen that I have thus provided a simple and highly effective means for 'securing the metal attaching members to the ends of a fabric ink pad. A particular feature of the present invention resides in the use of a ller disposed Within a loop or hem at the ends of the fabric sheet to form a pre-formed bead, enlargement, ridge, or in effect, a shoulder, which is tightly interlocked in a single fold or a substantially closed loop formed in the associated metal attaching member. This shoulder or bead formed by the provision of a filler Within the hem of the fabric when thus interlocked with the folded portion of an attaching member forms a continuous, uniform connection therewith throughout the entire Width of the fabric sheet. Displacement of the fabric sheet from the metal attaching members is further prevented by the provision of projections IiiaL on the metal which are forced into and pierce the hem portion of the fabric at spaced intervals throughout its Width.

Although I have shown and described the ller i4 disposed Within the hem vof thefabric as being a textilelcord in the present instance, it

will bey clear that fromv certain aspects of my? invention, a filler serving the same purpose could vbe provided by using` other materials. For example, it may in some instances be desirable to,

substitute a small metal rod or Wire in place of 4 this cord, or any other article or construction may be used which v'Will form a ridge or beadat the ends of the textile sheet I0 to be received in f and rinterlock with the closed channel of the metal attaching members.

Various changes may be made in the construc` tion, and certain features thereof may be omitted without departing from my invention 'as' it is defined in the ,accompanying claims.

What I claim as newand desire to secure by Letters Patent is: f

1. In an ink pad for duplicating machines, the combination of a fabric sheetA having 'a loop/at one end thereof formed by va'free end portion of the sheet being lstitched to the body portion thereof, acord disposed Within said loop, and a metal attaching member having a portionthereof folded around the part of said loop which 'carries the cord to cause the edge of the 'attaching member to engage the 'loop between 'the 'stitching and the cord. i

2. In an ink pad forA duplicating machines, the combination of 'a fabricsheet having a loop at one end thereof formed by afree end portion of 'the sheet being stitched to the body'portion thereof, a cord disposed Within said loop, .and a i. metal attaching member having a portion folded around the end of said Aloop to 'press the'edge of the attaching member against the loop between the stitched portion and the portion carrying the cord and to cause the loop :to 'extend faroundsaidv 40.

edge of the attaching member.

3. In an ink pad for duplicating`-machines, the combination of a fabric sheet having a-hern at each end thereof formed by-xedlyfsecuring a free end portion of the sheet to -th'e bodyfportion j thereof, a filler member disposed Within eachof said hems adjacent the end Wall thereof, and a metal attaching member rfor eachend of said sheet, each of said attaching members being folded around the end of the companionh'em to clamp the intermediate portion thereofbe'tvveen the edge and body portion of the attaching member. e

4. In an ink pad for duplicatingmachines, the

combination of a fabric sheet having a hem at i Y 5. In an ink pad for duplicating machinea'the combination of a lfabric sheet having a loop at I one end thereof, va filler member disposed within said loop adjacent the 'en d Wall thereof, and a metal attaching member extending beyond the end of said loop and having a portion foldedback over the part of the loop carrying the filler niem-A ber, said loop being doubled over the `edge ofthe folded portion of the attaching member.

ROBERT A.y DALTON. 

